Book Image

Cloud Native with Kubernetes

By : Alexander Raul
Book Image

Cloud Native with Kubernetes

By: Alexander Raul

Overview of this book

Kubernetes is a modern cloud native container orchestration tool and one of the most popular open source projects worldwide. In addition to the technology being powerful and highly flexible, Kubernetes engineers are in high demand across the industry. This book is a comprehensive guide to deploying, securing, and operating modern cloud native applications on Kubernetes. From the fundamentals to Kubernetes best practices, the book covers essential aspects of configuring applications. You’ll even explore real-world techniques for running clusters in production, tips for setting up observability for cluster resources, and valuable troubleshooting techniques. Finally, you’ll learn how to extend and customize Kubernetes, as well as gaining tips for deploying service meshes, serverless tooling, and more on your cluster. By the end of this Kubernetes book, you’ll be equipped with the tools you need to confidently run and extend modern applications on Kubernetes.
Table of Contents (22 chapters)
1
Section 1: Setting Up Kubernetes
5
Section 2: Configuring and Deploying Applications on Kubernetes
11
Section 3: Running Kubernetes in Production
16
Section 4: Extending Kubernetes

Understanding StatefulSets

StatefulSets are very similar to ReplicaSets and Deployments, but with one key difference that makes them better for stateful workloads. StatefulSets maintain the order and identity of each Pod, even if the Pods are rescheduled onto new nodes.

For instance, in a StatefulSet of 3 replicas, there will always be Pod 1, Pod 2, and Pod 3, and those Pods will maintain their identity in Kubernetes and storage (which we'll get to in Chapter 7, Storage on Kubernetes), regardless of any rescheduling that happens.

Let's take a look at a simple StatefulSet configuration:

statefulset.yaml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: stateful
spec:
  selector:
    matchLabels:
      app: stateful-app
  replicas: 5
  template:
    metadata:
      labels:
       &...